/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMController.h
Renames the variable name in all relevant nodes.
bool OnExternalVariableRenamed ( const [FName](API\Runtime\Core\UObject\FName) & InOldVarName, const [FName](API\Runtime\Core\UObject\FName) & InNewVarName, bool bSetupUndoRedo )